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Find filesystem of a partition from a script
How to show the filesystem type via the terminal?

I'm looking for a command that yields the filesystem type as mount would use/detect it, without actually mounting it. It should also work e.g. for LUKS encrypted devices (where file -s yields "LUKS encrypted file" instead of "crypto_LUKS"). Surely there is a more convenient way than parsing fsck -N /dev/whatever's output (which may use stderr depending on the existence of a corresponding fsck.TYPE)?

There are multiple ways to get this information. Most of them require you to parse the output of another command.

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  Run # fdisk /dev/sdX -l to get a basic idea of the filesystem structure. The output is something like this:

  
  
  

  Disk /dev/sda: 320.1 GB, 320072933376 bytes, 625142448 sectors
  Units = sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disk identifier: 0x9f7685a8
  
   Device Boot Start End Blocks Id System
  /dev/sda1 63 289169 144553+ 83 Linux
  /dev/sda2 289170 459121634 229416232+ 83 Linux
  /dev/sda3 459121635 461129759 1004062+ 82 Linux swap / Solaris
  /dev/sda4 * 461129760 625142447 82006344 7 HPFS/NTFS/exFAT
  

  
  
  

  But this will only tell you the partition type.

  
  


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  You could also use # blkid to get the following output:

  
  
  

  /dev/sda1: LABEL="boot" UUID="aa84c5a8-6408-4952-b577-578f2a67af86" TYPE="ext2" 
  /dev/sda2: LABEL="root" UUID="a430e0ef-fd35-432f-8b9a-75a49b89ad8a" TYPE="ext4" 
  /dev/sda3: LABEL="swap" UUID="e388806a-dc27-4f4e-a136-3d1ff4e53962" TYPE="swap" 
  /dev/sda4: UUID="088E027A8E026114" TYPE="ntfs" 
  

  
  


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  Also, for a well formatted output, you could run # parted /dev/sdX -l for the following output:

  
  
  

  Model: ATA WDC WD3200BEVT-7 (scsi)
  Disk /dev/sda: 320GB
  Sector size (logical/physical): 512B/512B
  Partition Table: msdos
  Disk Flags: 
  
  Number Start End Size Type File system Flags
   1 32.3kB 148MB 148MB primary ext2
   2 148MB 235GB 235GB primary ext4
   3 235GB 236GB 1028MB primary linux-swap(v1)
   4 236GB 320GB 84.0GB primary ntfs boot
  

  
  


• 
  

  $ df -T. This is another command that does not require super user privileges to execute. However, this will report for every mount point

  
  
  

  Filesystem Type 1K-blocks Used Available Use% Mounted on
  rootfs rootfs 225815276 99381340 114963128 47% /
  dev devtmpfs 1538396 0 1538396 0% /dev
  run tmpfs 1541260 416 1540844 1% /run
  /dev/sda2 ext4 225815276 99381340 114963128 47% /
  tmpfs tmpfs 1541260 360 1540900 1% /dev/shm
  tmpfs tmpfs 1541260 0 1541260 0% /sys/fs/cgroup
  tmpfs tmpfs 1541260 900 1540360 1% /tmp
  /dev/sda1 ext2 139985 30386 102372 23% /boot
  /dev/sda4 fuseblk 82006340 79676036 2330304 98% /mnt
  

  
  

Another command that can come handy is # file -sL /dev/sdXY. This has one downside in that it does not work with the full block device. Requires the exact device to be passed. The output is quite neat though:

/dev/sda1: Linux rev 1.0 ext2 filesystem data (mounted or unclean), UUID=aa84c5a8-6408-4952-b577-578f2a67af86, volume name "boot"

All of these will always be output to stdout. You can parse them in a script if required.